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以Al2O3陶瓷球为对偶材料,借助UMT-2型摩擦磨损试验机研究了温度、载荷和转速对铸态SiCp/A356复合材料干滑动摩擦磨损特性的影响,并利用扫描电镜和奥林巴斯激光共焦扫描显微镜观察分析其磨损行为。结果表明,载荷和转速一定时,随温度的升高,材料的摩擦稳定性和耐磨性能急剧下降,磨损机理也由剥落磨损转变为严重的粘着磨损。磨损过程中,载荷和转速引起材料摩擦表面温度变化,以及材料中SiC颗粒的影响,使得材料的磨损率随载荷增加而增加,摩擦因数则随载荷先增加后减小。随温度、载荷和转速增加,复合材料的摩擦稳定性和耐磨性都大幅度下降。
The effects of temperature, load and rotation speed on the dry sliding friction and wear properties of as-cast SiCp / A356 composites were investigated by means of a UMT-2 friction and wear tester with Al2O3 ceramic balls as the dual material. Scanning electron microscopy and Olympus laser Confocal scanning microscope observation of wear behavior. The results show that with the increase of temperature, the frictional stability and wear resistance of the material decrease sharply at certain load and rotational speed, and the wear mechanism changes from exfoliation wear to severe adhesion wear. In the process of wear, the temperature and the speed of the frictional surface caused by the load and rotation speed, as well as the influence of the SiC particles in the material, the wear rate of the material increases with the increase of the load, while the friction coefficient increases first and then decreases with the increase of the load. With the increase of temperature, load and speed, the frictional stability and wear resistance of the composites decrease greatly.